4 The American Naturalist. [January, 
dogs, the one was in every respect normally formed, and in 
color and form the true likeness of the mother, whereas the 
other dog not only resembled exactly the father, but also like 
him possessed an abnormally placed right fore leg, and con- 
tinually limped with this leg from birth up to to-day, when 
the animal has long since reached full growth. At the sight 
of the dog, all eye-witnesses were completely convinced of the 
fact of the transmission of a former injury. 
As will be easily understood, my attention was at once 
directed to establishing whether the peculiarities in question 
really corresponded exactly in father and son. To begin with, 
I found that after the fall, the right fore-leg of the father was 
essentially different from the left, and had remained so con- 
stantly, and that the animal continually limped on this leg, 
and always in the same way. A certain weakness and great 
tenderness is noticeable even to-day in the entire shoulder 
region, and especially at the spot at which the injury took 
place ; the entire musculature on the humerus is also strikingly 
degenerate. The position of the injured leg (especially from 
elbow joint down) differs in a curious way from that of the 
uninjured left leg. The entire extremity has a fully crippled 
appearance. The apparently shortened forearm and foot of 
_ the right foreleg assume unmistakably a bow-legged position, 
and the entire extremity is strikingly bent inward. 
The investigation of the limping young dog showed the fol- 
lowing: In spite of careful feeling I could find on the right 
foreleg neither a sensitive place nor an abnormity of humerus 
or of the musculature; on the contrary, the right foreleg is 
externally completely similar to the left, but unquestionably 
different in posture and shape from the latter. While now in 
the father the right leg is “ O ”-shaped (bow-legged), and the 
foot is turned inward, the corresponding leg of the young dog 
_ Shows exactly the reverse tendency in posture. It is rather 
“X”-shaped (“knock-kneed ”) and the foot is turned outward, 
but by no means so much as the corresponding foot of the 
father turns inward. The difference in the posture of the leg 
does not strike one so much when the two young dogs are ob- 
served together as when the father and the limping one are 
